What was Tang Xianzu demoted for writing a letter to Emperor Wanli?

On assistant ministers, ministers and ministers. Tang Xianzu was a famous dramatist and writer in Ming Dynasty, and his works played an important role in the history of China literature. However, Tang Xianzu encountered twists and turns in politics. According to historical records, Tang Xianzu once angered Emperor Wanli by writing "On Auxiliary Ministers and Shangshu", and was eventually relegated to xuwen county as a canon history.